Bitmapallows us to convert a graphics file into the native GDI+ format (bitmap).This class can be used to define images as fill patterns, transform images fordisplay, define the look of a button—its uses are many. Specifically, in this article we will discuss the methods and properties of the Graphics class, and how to use them in real-world applications, including line charts, pie charts, and our GDI+Painter application. The namespace library gives us three classes for working with images:Image, Bitmapand Icon. Whenever an application needs to draw or paint something, it has to use the Graphics object. After drawing the line, you can then change its color, width and style using the BorderColor, BorderWidth and BorderStyle properties.Similarly, to draw a shape, just click on the shape control and draw the shape on the form. Bitmaps (… Smoothing modes include high quality, high speed, and anti-aliasing. Dim btn as New Button Dim g As Graphics = btn.CreateGraphics From an Existing Graphic; Use this method when you want to draw and change an existing graphic 'The existing image can be from a filename, stream or Drawing.Graphic Dim image = New Bitmap("C:\TempBit.bmp") Dim gr As Graphics = Graphics.FromImage(image) Graphics objects are the heart of GDI+. Whenever an application needs to draw or paint something, it has to use the Graphics object. The Graphics object represents a GDI+ drawing surface, and is the object that is used to create graphical images.. However, its simplicity has the shortcomings, you don’t have many choices in creating customized drawings. Draws a closed cardinal spline defined by an array of Point structures. Hence, understanding the Graphics class, its methods, and its properties is very important. Returns a RectangeF structure that bounds the clipping region of this Graphics object. Gets and sets a Region type that limits the drawing region of the Graphics object. Supports read only access. Draws the specified Image object at the specified location and with the original size. Then, of course, you have to create a sub to handle that event, such as:. Gets and sets the visible clipping region of the Graphics object (the intersection of the clipping region of the Graphics object and the clipping region of the window). Gets and sets the world transformation matrix (transformation is the process of converting graphics objects from one state to another). They are represented by the Graphics class, which defines methods and properties to draw and fill graphics objects. There are three ways to create a graphics object, Every time the control is redrawn (resized, refreshed...) this event is called, use this way if you want the control to consistently draw on the control, This is most often used when you want to create a one time graphic on the control, or you don't want the control to repaint itself, Use this method when you want to draw and change an existing graphic, This modified text is an extract of the original Stack Overflow Documentation created by following, Getting started with Visual Basic .NET Language, Short-Circuiting Operators (AndAlso - OrElse). The default shape is a rectangle, with the default shape property set at 0. Draws a pie shape specified by a coordinate pair, a width, a height, and two radial lines. It is not intended as a serious piece of image editing software (we will leave that to the professionals) but despite its limitations can produce some interesting effects. Gets and sets the rendering quality (directly proportional to the visual quality of the output and inversely proportional to the rendering time) of composite images, represented by the CompositingQuality enumeration. They are represented by the Graphics class, which defines methods and properties to draw and fill graphics objects. The transformation state is represented by a transformation matrix. Working with Images in VB.Net The application we are going to build here can manipulate images in various ways. Draws an image represented by the specified Icon object without scaling the image. There are two steps in working with graphics: In this article I will explain you about the Graphic Class methods and properties. Gets and sets the text rendering quality (TextRenderingHint enumeration). All rights reserved. In the chapter of Visual Basic Essentials we will cover the drawing of 2D graphics on controls using Visual Basic. Returns the vertical resolution (dots per inch) of a Graphics object. Creating graphics was relatively easy in earlier versions of Visual Basic because they have built-in drawing tools. Hence, understanding the Graphics class, its methods, and its properties is very important. © 2020 DotNetHeaven. Although the bitmapformat is used to manipulate images at the pixel level, GDI+ can actually workwith the following image types: 1. Gets and sets the gamma correction value for rendering anti-aliased and ClearType text values, ranging from 0 to 12. Affects only text drawn on the Graphics object. Gets and sets a value that represents the unit of measure for page coordinates. 03/30/2017; 4 minutes to read; In this article. Draws a cardinal spline through a specified array of Point structures. Returns the horizontal resolution (dots per inch) of a Graphics object. Gets and sets a value for the pixel offset mode (PixelOffsetMode enumeration). The Graphics class provides a long list of properties (see Table 3.1) and methods. Returns a value indicating whether the clipping region of a Graphics object is empty. The default is 4. For example, In Visual Basic 6, the drawing tools are included in the toolbox where the programmer just needs to drag the shape controls into the form to create rectangle, square, ellipse, circle and more. TABLE 3.1: Graphics properties. Draws the specified text string at the specified location using the specified Brush and Font objects. Draws a line connecting two points specified by coordinate pairs. Before you can draw lines and shapes, render text, or display and manipulate images with GDI+, you need to create a Graphics object. Draws a series of line segments that connect an array of Point structures. Draws a series of rectangles specified by an array of Rectangle structures. Returns a value indicating whether the visible clipping region of a Graphics object is empty. In this tutorial we will create a project containing a blank form and work step by step through drawing on the form. Draws a polygon defined by an array of Point structures. Private Sub PaintBackground(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Dim g As Graphics = e.Graphics g.DrawLine(New System.Drawing.Pen(Color.Blue, 2), 50, 50, 150, 175) g.DrawString("hello", Me.Font, Brushes.Blue, 150, 150) End Sub. Graphics Class Properties Returns a value of type CompositingMode enumeration representing how composite images are drawn to the Graphics object. How to: Create Graphics Objects for Drawing. Draws the specified Image object with its original size at the location specified by a coordinate pair. When there is no clipping this property return false. Graphics objects are the heart of GDI+. Draws an ellipse defined by a bounding rectangle specified by a pair of coordinates, a height, and a width. GDI+Painter is similar to the PaintBrush application, which allows you to draw simple graphics object such as lines, rectangles, and circles and save the images as bitmaps. Conversion Classes & CultureInfo Class in VB.NET, TextReader and TextWriter Classes in VB.NET, BinaryReader and BinaryWriter Classes in VB.NET, Creating Your Own Exception Classes in VB.NET, String and Math Functions in Visual Basic .NET, Directory and DirectoryInfo Classes in VB.NET, Using Count Property Of Dictionary Class In VB.NET, Designing GUI Applications in GDI+ using VB.NET, No GDI Calls between GetHdc and ReleaseHdc in VB.NET, Use GDI+ System Brushes and Pens in VB.NET, Select Method carefully in GDI+ using VB.NET, Overriding the GDI+ OnPaint Method in VB.NET, GDI+ Double Buffering and Flicker-Free Drawing in VB.NET, GDi+ Scope and Type of Variable and Performance in VB.NET, Add GDI+ Paint Event Handler and Controls in VB.NET, Understanding the GDI+ Paint Event in VB.NET, Create ASP .NET Web Application in GDI+ using VB.NET, GDI+ LinearGradientBrush and PathGradientBrush in VB.NET, Graphics Web Application in GDI+ usnig VB.NET, Adding GDI+ Web Controls to a Web Form in VB.NET, Customizing Page Settings in GDI+ using VB.NET, DetailsCustom Controlling and Print Controller in VB.NET, The DocumentName Property and Marginal Printing in VB.NET, Draw 2D graphics line,tringle,ellipse,polygon in VB.NET, A GDI+ Printer Settings Example in VB.NET, Color Transformation and the Color Matrix in VB.NET, Image Transformation in GDI+ using VB.NET, GDI+ Scaling, Shearing and Rotating Colors in VB.NET, GDI+ Miscellaneous Advanced 2D Topics in VB.NET. 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